<template>
  <div class="wrapper">
    <div v-show="model" class="model">
      <div class="model-show" @click="model = false">
        <img :src="modelSrc" alt="" @click="model = false">
      </div>
    </div>
    <div class="content">
      <div class="show-info">
        <div class="test test1">
          <vueCropper
              ref="cropper"
              :autoCrop="option.autoCrop"
              :autoCropHeight="option.autoCropHeight"
              :autoCropWidth="option.autoCropWidth"
              :canMove="option.canMove"
              :canMoveBox="option.canMoveBox"
              :centerBox="option.centerBox"
              :enlarge="option.enlarge"
              :fixedBox="option.fixedBox"
              :full="option.full"
              :high="option.high"
              :img="option.img"
              :info="true"
              :infoTrue="option.infoTrue"
              :limitMinSize="option.limitMinSize"
              :maxImgSize="option.maxImgSize"
              :mode="option.mode"
              :original="option.original"
              :outputSize="option.size"
              :outputType="option.outputType"
              @cropMoving="cropMoving"
              @imgLoad="imgLoad"
              @realTime="realTime"
          ></vueCropper>
        </div>
        <div class="test-button">
          <button class="btn" @click="changeImg">changeImg</button>
          <label class="btn" for="uploads">upload</label>
          <input id="uploads" ref="uploadImg" accept="image/png, image/jpeg, image/gif, image/jpg"
                 style="position:absolute; clip:rect(0 0 0 0);" type="file" @change="uploadImg($event, 1)">
          <button v-if="!crap" class="btn" @click="startCrop">start</button>
          <button v-else class="btn" @click="stopCrop">stop</button>
          <button class="btn" @click="clearCrop">clear</button>
          <button class="btn" @click="refreshCrop">refresh</button>
          <button class="btn" @click="changeScale(1)">+</button>
          <button class="btn" @click="changeScale(-1)">-</button>
          <button class="btn" @click="rotateLeft">rotateLeft</button>
          <button class="btn" @click="rotateRight">rotateRight</button>
          <button class="btn" @click="finish('base64')">preview(base64)</button>
          <button class="btn" @click="finish('blob')">preview(blob)</button>
          <button class="btn" @click="() => option.img = ''">清除图片</button>
          <a class="btn" @click="down('base64')">download(base64)</a>
          <a class="btn" @click="down('blob')">download(blob)</a>
          <a ref="downloadDom" :href="downImg" download="demo.png"></a>
        </div>

        <div class="pre">
          <section class="pre-item">
            <p>截图框大小</p>
            <div :style="{'width': previews.w + 'px', 'height': previews.h + 'px',  'overflow': 'hidden',
							'margin': '5px'}" class="show-preview">
              <div :style="previews.div">
                <img :src="previews.url" :style="previews.img">
              </div>
            </div>
          </section>

          <section class="pre-item">
            <p>中等大小</p>
            <div :style="previewStyle1">
              <div :style="previews.div">
                <img :src="previews.url" :style="previews.img">
              </div>
            </div>
          </section>

          <section class="pre-item">
            <p>迷你大小</p>
            <div :style="previewStyle2">
              <div :style="previews.div">
                <img :src="previews.url" :style="previews.img">
              </div>
            </div>
          </section>

          <section class="pre-item" title="zoom: (100 / previews.w)">
            <p>固定为100宽度</p>
            <div :style="previewStyle3">
              <div :style="previews.div">
                <img :src="previews.url" :style="previews.img">
              </div>
            </div>
          </section>

          <section class="pre-item" title="zoom: (100 / previews.h)">
            <p>固定为100高度</p>
            <div :style="previewStyle4">
              <div :style="previews.div">
                <img :src="previews.url" :style="previews.img">
              </div>
            </div>
          </section>
        </div>

        <div style="display:block; width: 100%;">
          <label class="c-item">
            <span>图片默认渲染方式</span>
            <select v-model="option.mode">
              <option value="contain">contain</option>
              <option value="cover">cover</option>
              <option value="400px auto">400px auto</option>
              <option value="auto 400px">auto 400px</option>
              <option value="50%">50%</option>
              <option value="auto 50%">auto 50%</option>
            </select>
            <section>
              类似css background属性设置 设置不符合规范不生效， 参照文档说明
            </section>
          </label>
          <label class="c-item">
            <span>上传时图片最大大小(默认会压缩尺寸到这个大小)</span>
            <input v-model="option.maxImgSize" type="nubmer">
          </label>
          <label class="c-item">
            <span>上传图片是否显示原始宽高 (针对大图 可以铺满)</span>
            <input v-model="option.original" type="checkbox">
            <span>original: {{ option.original }}</span>
          </label>
          <label class="c-item">
            <span>是否根据dpr生成适合屏幕的高清图片</span>
            <input v-model="option.high" type="checkbox">
            <span>high: {{ option.high }}</span>
          </label>
          <label class="c-item">
            <span>是否输出原图比例的截图</span>
            <input v-model="option.full" type="checkbox">
            <span>full: {{ option.full }}</span>
          </label>
          <label class="c-item">
            <span>截图信息展示是否是真实的输出宽高</span>
            <input v-model="option.infoTrue" type="checkbox">
            <span>infoTrue: {{ option.infoTrue }}</span>
          </label>
          <label class="c-item">
            <span>能否拖动图片</span>
            <input v-model="option.canMove" type="checkbox">
            <span>canMove: {{ option.canMove }}</span>
          </label>
          <label class="c-item">
            <span>能否拖动截图框</span>
            <input v-model="option.canMoveBox" type="checkbox">
            <span>canMoveBox: {{ option.canMoveBox }}</span>
          </label>
          <label class="c-item">
            <span>截图框固定大小</span>
            <input v-model="option.fixedBox" type="checkbox">
            <span>fixedBox: {{ option.fixedBox }}</span>
          </label>
          <label class="c-item">
            <span>是否自动生成截图框</span>
            <input v-model="option.autoCrop" type="checkbox">
            <span>autoCrop: {{ option.autoCrop }}</span>
          </label>
          <label class="c-item">
            <span>自动生成截图框的宽高</span>
            <span>宽度:  </span><input v-model="option.autoCropWidth" type="number">
            <span>高度:  </span><input v-model="option.autoCropHeight" type="number">
          </label>
          <label class="c-item">
            <span>截图框是否限制在图片里(只有在自动生成截图框时才能生效)</span>
            <input v-model="option.centerBox" type="checkbox">
            <span>centerBox: {{ option.centerBox }}</span>
          </label>
          <label class="c-item">
            <span>是否按照截图框比例输出 默认为1 </span>
            <input v-model="option.enlarge" type="number">
          </label>
          <p>输出图片格式</p>
          <label class="c-item">
            <label>jpg <input v-model="option.outputType" name="type" type="radio" value="jpeg"></label>
            <label>png <input v-model="option.outputType" name="type" type="radio" value="png"></label>
            <label>webp <input v-model="option.outputType" name="type" type="radio" value="webp"></label>
          </label>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {VueCropper} from 'vue-cropper'

export default {
  name: 'ImagCropper',
  components: {
    VueCropper
  },
  data() {
    return {
      model: false,
      modelSrc: "",
      crap: false,
      previews: {},
      lists: [
        {img: "https://avatars2.githubusercontent.com/u/15681693?s=460&v=4"},
        {img: "http://cdn.xyxiao.cn/Landscape_1.jpg"},
        {img: "http://cdn.xyxiao.cn/Landscape_2.jpg"},
        {img: "http://cdn.xyxiao.cn/Landscape_3.jpg"},
        {img: "http://cdn.xyxiao.cn/Landscape_4.jpg"},
        {img: "http://cdn.xyxiao.cn/Portrait_1.jpg"},
        {img: "http://cdn.xyxiao.cn/Portrait_2.jpg"}
      ],
      option: {
        img: "",
        size: 1,
        full: false,
        outputType: "png",
        canMove: true,
        fixedBox: false,
        original: false,
        canMoveBox: true,
        autoCrop: true,
        // 只有自动截图开启 宽度高度才生效
        autoCropWidth: 200,
        autoCropHeight: 150,
        centerBox: false,
        high: false,
        cropData: {},
        enlarge: 1,
        mode: 'contain',
        maxImgSize: 3000,
        limitMinSize: [100, 120]
      },
      example2: {
        img: "http://cdn.xyxiao.cn/Landscape_2.jpg",
        info: true,
        size: 1,
        outputType: "jpeg",
        canScale: true,
        autoCrop: true,
        // 只有自动截图开启 宽度高度才生效
        autoCropWidth: 300,
        autoCropHeight: 250,
        fixed: true,
        // 真实的输出宽高
        infoTrue: true,
        fixedNumber: [4, 3]
      },
      example3: {
        img: "http://cdn.xyxiao.cn/Landscape_1.jpg",
        autoCrop: true,
        autoCropWidth: 200,
        autoCropHeight: 200,
        fixedBox: true
      },
      downImg: "#",
      previewStyle1: {},
      previewStyle2: {},
      previewStyle3: {},
      previewStyle4: {},
      code0: '',
      code1: '',
      code2: '',
      code3: '',
      preview3: '',
    };
  },
  methods: {
    changeImg() {
      this.option.img = this.lists[~~(Math.random() * this.lists.length)].img;
    },
    startCrop() {
      // start
      this.crap = true;
      this.$refs.cropper.startCrop();
    },
    stopCrop() {
      //  stop
      this.crap = false;
      this.$refs.cropper.stopCrop();
    },
    clearCrop() {
      // clear
      this.$refs.cropper.clearCrop();
    },
    refreshCrop() {
      // clear
      this.$refs.cropper.refresh();
    },
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    finish(type) {
      if (type === "blob") {
        this.$refs.cropper.getCropBlob(data => {
          var img = window.URL.createObjectURL(data);
          this.model = true;
          this.modelSrc = img;
        });
      } else {
        this.$refs.cropper.getCropData(data => {
          this.model = true;
          this.modelSrc = data;
        });
      }
    },
    // 实时预览函数
    realTime(data) {
      var previews = data;
      var h = 0.5;
      var w = 0.2;

      this.previewStyle1 = {
        width: previews.w + "px",
        height: previews.h + "px",
        overflow: "hidden",
        margin: "0",
        zoom: h
      };

      this.previewStyle2 = {
        width: previews.w + "px",
        height: previews.h + "px",
        overflow: "hidden",
        margin: "0",
        zoom: w
      };

      this.previewStyle3 = {
        width: previews.w + "px",
        height: previews.h + "px",
        overflow: "hidden",
        margin: "0",
        zoom: (100 / previews.w)
      };

      this.previewStyle4 = {
        width: previews.w + "px",
        height: previews.h + "px",
        overflow: "hidden",
        margin: "0",
        zoom: (100 / previews.h)
      };

      this.previews = data;
    },

    finish2(type) {
      this.$refs.cropper2.getCropData(data => {
        this.model = true;
        this.modelSrc = data;
      });
    },
    finish3(type) {
      this.$refs.cropper3.getCropData(data => {
        this.model = true;
        this.modelSrc = data;
      });
    },
    down(type) {
      // 输出
      if (type === "blob") {
        this.$refs.cropper.getCropBlob(data => {
          this.downImg = window.URL.createObjectURL(data);
          if (window.navigator.msSaveBlob) {
            var blobObject = new Blob([data]);
            window.navigator.msSaveBlob(blobObject, "demo.png");
          } else {
            this.$nextTick(() => {
              this.$refs.downloadDom.click();
            });
          }
        });
      } else {
        this.$refs.cropper.getCropData(data => {
          this.downImg = data;
          if (window.navigator.msSaveBlob) {
            var blobObject = new Blob([data]);
            window.navigator.msSaveBlob(blobObject, "demo.png");
          } else {
            this.$nextTick(() => {
              this.$refs.downloadDom.click();
            });
          }
        });
      }
    },

    uploadImg(e, num) {
      //上传图片
      // this.option.img
      var file = e.target.files[0];
      if (!/\.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)) {
        alert("图片类型必须是.gif,jpeg,jpg,png,bmp中的一种");
        return false;
      }
      var reader = new FileReader();
      reader.onload = e => {
        let data;
        if (typeof e.target.result === "object") {
          // 把Array Buffer转化为blob 如果是base64不需要
          data = window.URL.createObjectURL(new Blob([e.target.result]));
        } else {
          data = e.target.result;
        }
        if (num === 1) {
          this.option.img = data;
        } else if (num === 2) {
          this.example2.img = data;
        }
        this.$refs.uploadImg.value = ''
      };
      // 转化为blob
      reader.readAsArrayBuffer(file);
    },
    imgLoad(msg) {
      console.log(msg);
    },

    cropMoving(data) {
      this.option.cropData = data;
    }
  },
  components: {
    VueCropper
  },
  mounted() {
    this.changeImg();
    var list = [].slice.call(document.querySelectorAll("pre code"));
    list.forEach((val, index) => {
      hljs.highlightBlock(val);
    });
  }
};
</script>

<style scoped>
* {
  margin: 0;
  padding: 0;
}

.content {
  margin: auto;
  max-width: 1200px;
  margin-bottom: 100px;
}

.test-button {
  display: flex;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c0ccda;
  color: #1f2d3d;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 20px 10px 0px 0px;
  padding: 9px 15px;
  font-size: 14px;
  border-radius: 4px;
  color: #fff;
  background-color: #50bfff;
  border-color: #50bfff;
  transition: all 0.2s ease;
  text-decoration: none;
  user-select: none;
}

.des {
  line-height: 30px;
}

code.language-html {
  padding: 10px 20px;
  margin: 10px 0px;
  display: block;
  background-color: #333;
  color: #fff;
  overflow-x: auto;
  font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo,
  Lucida, Sans, Type, Writer, Ubuntu, Mono;
  border-radius: 5px;
  white-space: pre;
}

.show-info {
  margin-bottom: 50px;
}

.show-info h2 {
  line-height: 50px;
}

.title {
  display: block;
  text-decoration: none;
  text-align: center;
  line-height: 1.5;
  margin: 20px 0px;
  background-image: -webkit-linear-gradient(
      left,
      #3498db,
      #f47920 10%,
      #d71345 20%,
      #f7acbc 30%,
      #ffd400 40%,
      #3498db 50%,
      #f47920 60%,
      #d71345 70%,
      #f7acbc 80%,
      #ffd400 90%,
      #3498db
  );
  color: transparent;
  -webkit-background-clip: text;
  background-size: 200% 100%;
  animation: slide 5s infinite linear;
  font-size: 40px;
}

.test {
  height: 500px;
}

.model {
  position: fixed;
  z-index: 10;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.8);
}

.model-show {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
  text-align: center;
}

.model img {
  display: block;
  margin: auto;
  max-width: 80%;
  width: auto;
  user-select: none;
  background-position: 0px 0px, 10px 10px;
  background-size: 20px 20px;
  background-image: linear-gradient(
      45deg,
      #eee 25%,
      transparent 25%,
      transparent 75%,
      #eee 75%,
      #eee 100%
  ),
  linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
}

.c-item {
  display: block;
  padding: 10px 0;
  user-select: none;
}

.pre {
  display: flex;
  flex-wrap: wrap;
}

.pre-item {
  padding-right: 20px;
}

@keyframes slide {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: -100% 0;
  }
}

@media screen and (max-width: 1000px) {
  .content {
    max-width: 90%;
    margin: auto;
  }

  .test {
    height: 400px;
  }
}
</style>